Manufacture of paper for electric printing.



ITE

WILLIAM FRIESE-GREENE, OF LONDON, ENGLAND.

MANUFACTURE OF PAPER FOR ELECTIC PRINTING.

SPECIFICATION formingpart of Letters Patent No. 655,970, dated August 14, 1900.

Application filed March 13 1900. Serial No. 8,443. (No specimens.)

To all whom it may concern:

Be it known that 1, WILLIAM FRIESE- GREENE, photographer, of 39 Kings road, Chelsea, London, England, have invented certain new and useful Improvements in the Manufacture of Paper for Electric Printing, of which the following is a specification.

In my prior application for patent, Serial No. 733,130, filed October 10, 1899, for an improvement in paper, 810. ,I describe and claim, broadly, an article of manufacture such as paper or textile fabric containing a substance which will instantaneously form visible and permanent marks when an electrical current is passed through the same in the presence of moisture. My present invention has reference to one specific variety of such paper and to the manufacture thereof, said paper being especially adapted for use in electrical inkless printing.

The present invention consists in applying an extract, liquid, or solution of the character hereinafter described to the paper in the course of the manufacture of the latter. The extract, liquid, or solution may be incorporated with pulp before its manufacture into paper or may be distributed, preferably in a state of fine division, upon the layer of pulp when on the wire web or other former before or during the forming of the paper, or upon the paper after it has formed, and either when still moist or after it has become dry. The said liquid or solution is an extract of marine algae and is obtained, preferably, as follows:

I take sea-water and place therein an amount of a marine algaor marine algae, preferably seaweedsay"one pound to the gallon-and add common washing sodasay one-fourth of a pound per pound of-weed. I boil the mixture until the liquor becomes cloudedsay for about twentyfive minutes. This cloudiness in due to a substance of an alkaline nature in suspension. I then add, preferably after the liquor has cooled, sufficient acid, hydrochloric by preference, to dissolve the clouding matter. I decant off the liquor and add to it hyposulfite of soda in the proportion of, say, one-fourth of a pound per gallon of decanted liquor. I thus get the extract, liquid, or solution, which I incorporate with paper-pulp or distribute over the paper during or after forming, as hereinbefore explained. The finished paper shall contain about five per cent. of the liquid or extract.

The proportions above specified are those which I have found to give the best results in practice; but it will be understood that I do not limit myself thereto.

Paper thus made will give an instantaneous and permanent dark-brown print produced electrically thereon.

I have not yet ascertained the exact nature or composition of the liquid or solution obtained in the manner hereinbefore described, nor am I at present certain as to what ingredient or ingredients of same are effective in electrical inkless printing. The present invention includes the use of the effective ingredient or ingredients in the manner described, whether produced as hereinbefore described or in any other way.

Nhat I claim, and desire to secure by Letters Patent, is-

1. The method or process of making paper suitable for electric printing, which consists in treating paper with an extract of marine algae, substantially as described.

2. The method or process of making paper suitable for electric printing, which consists in treating paper with an extract of seaweed, substantially as described.

3. In the manufacture of paper suitable for electric printing the process which consists in boiling seaweed in sea-water to which carbonate of soda has been added, adding acid to the resulting liquor, then separating the supernatantliquor,adding hyposulfite of soda thereto and adding the resulting extract to paper, substantially as described.

4. As a new product, paper suitable for elec tric printing containing an extract of marine algae.

5. Asanew product, papersuitableforelectric printing containing an extract of seaweed.

6. As a new product, paper containing the extract obtained by boiling seaweed in seawater to which carbonate of soda has been added, adding acid to the resulting liquor, and (after separating the supernatant liquor) adding hyposulfite of soda thereto.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses. 1

WILLIAM FRIESE-GREENE.

Witnesses:

GEoEeE BELoE ELLrs, ROBERT MILTON SPEARPOIN'I. 

